Combined In-Line DC and AC Current Sensor for High Voltage Electric Power Lines

1. An in-line combined DC and AC current sensor for an electric power line, comprising: a bus bar configured to be connected in-line with an electric power line conductor; an electronics board positioned transverse to the bus bar with the bus bar extending through the electronics board, electronic components carried on the electronics board comprising a microprocessor, a memory and a radio, the memory and the radio operatively connected to the microprocessor; a pair of DC current measurement pickups spaced apart on the bus bar and operatively connected to the microprocessor; a power supply coil operatively connected to the microprocessor and positioned transverse to the bus bar with the bus bar extending through the power supply coil, the power supply coil configured to harvest electric energy from the power line conductor and provide the harvested electric energy to power the electronic components; an AC current sensor coil operatively connected to the microprocessor and positioned transverse to the bus bar with the bus bar extending through the AC current sensor coil; an electronics board cover positioned transverse to the bus bar with the bus bar extending through the electronics board cover; an end plate positioned transverse to the bus bar with the bus bar extending through the end plate, with the electronics board, the DC current measurement pickups, the power supply coil, and the AC current sensor coil positioned between the electronics board cover and the end plate.

2. The in-line combined DC and AC current sensor of claim 1 , wherein: the electronic components are carried on a side of the electronics board; and a foil patch antenna element is carried on an opposing side of the electronics board.

3. The in-line combined DC and AC current sensor of claim 1 further comprising an antenna.

4. The in-line combined DC and AC current sensor of claim 3 , wherein the antenna comprises a first foil patch antenna element that transmits communication signals having a first polarity and a second foil patch antenna element that transmits communication signals having a second polarity orthogonal to the first polarity.

5. The in-line combined DC and AC current sensor claim 1 , further comprising a temperature sensor that generates a temperature signal representative of the bus bar temperature, which the microprocessor uses in temperature compensated computation of DC current flowing in the bus bar.

6. The in-line combined DC and AC current sensor claim 1 , further comprising: a first bracket connecting the electronics board cover to the bus bar; and a second bracket connecting the end plate to the bus bar.

7. The in-line combined DC and AC current sensor of claim 1 , wherein the electronic components further comprise a GPS device.

8. An in-line combined DC and AC current sensor system, comprising: an electric power switch; an electric power line conductor; an in-line electric power line monitoring device connected between the electric power switch and the electric power line conductor, comprising: a bus bar connected in-line with the electric power line conductor; an electronics board positioned transverse to the bus bar with the bus bar extending through the electronics board, electronic components carried on the electronics board comprising a microprocessor, a memory and a radio, the memory and the radio operatively connected to the microprocessor; a pair of DC current measurement pickups spaced apart on the bus bar and operatively connected to the microprocessor; a power supply coil operatively connected to the microprocessor and positioned transverse to the bus bar with the bus bar extending through the power supply coil, the power supply coil configured to harvest electric energy from the power line conductor and provide the harvested electric energy to power the electronic components; an AC current sensor coil operatively connected to the microprocessor and positioned transverse to the bus bar with the bus bar extending through the AC current sensor coil; an electronics board cover positioned transverse to the bus bar with the bus bar extending through the electronics board cover; an end plate positioned transverse to the bus bar with the bus bar extending through the end plate, with the electronics board, the DC current measurement pickups, the power supply coil, and the AC current sensor coil positioned between the electronics board cover and the end plate.

9. The in-line combined DC and AC current sensor system of claim 8 , wherein: the electronic components are carried on a side of the electronics board; and a foil patch antenna element is carried on an opposing side of the electronics board.

10. The in-line combined DC and AC current sensor system of claim 8 , further comprising an antenna.

11. The in-line combined DC and AC current sensor system of claim 10 , wherein the antenna comprises a first foil patch antenna element that transmits communication signals having a first polarity and a second foil patch antenna element that transmits communication signals having a second polarity orthogonal to the first polarity.

12. The in-line combined DC and AC current sensor system of claim 8 , further comprising a temperature sensor that generates a temperature signal representative of the bus bar temperature, which the microprocessor uses in temperature compensated computation of DC current flowing in the bus bar.

13. The in-line combined DC and AC current sensor system of claim 8 , further comprising: a first bracket connecting the electronics board cover to the bus bar; and a second bracket connecting the end plate to the bus bar.

14. The in-line combined DC and AC current sensor system of claim 8 , wherein the electronic components further comprise a GPS device.

15. A method for monitoring an electric power line connected to an electric power switch, comprising: connecting an in-line electric power line monitoring device to the electric power switch; connecting an electric power line conductor to the in-line electric power line monitoring device; the in-line electric power line monitoring device comprising: a bus bar connected in-line with the electric power line conductor; an electronics board positioned transverse to the bus bar with the bus bar extending through the electronics board, electronic components carried on the electronics board comprising a microprocessor, a memory and a radio, the memory and the radio operatively connected to the microprocessor; a pair of DC current measurement pickups spaced apart on the bus bar and operatively connected to the microprocessor; a power supply coil operatively connected to the microprocessor and positioned transverse to the bus bar with the bus bar extending through the power supply coil, the power supply coil configured to harvest electric energy from the power line conductor and provide the harvested electric energy to power the electronic components; an AC current sensor coil operatively connected to the microprocessor and positioned transverse to the bus bar with the bus bar extending through the AC current sensor coil; an electronics board cover positioned transverse to the bus bar with the bus bar extending through the electronics board cover; an end plate positioned transverse to the bus bar with the bus bar extending through the end plate, with the electronics board, the DC current measurement pickups, the power supply coil, and the AC current sensor coil positioned between the electronics board cover and the end plate.

16. The method of claim 15 , wherein: the electronic components are carried on a side of the electronics board; and a foil patch antenna element is carried on an opposing side of the electronics board.

17. The method of claim 15 , further comprising an antenna.

18. The method of claim 17 , wherein the antenna comprises a first foil patch antenna element that transmits communication signals having a first polarity and a second foil patch antenna element that transmits communication signals having a second polarity orthogonal to the first polarity.

19. The method of claim 15 , further comprising receiving a temperature signal representative of the bus bar temperature, and using the temperature signal in temperature compensated computation of DC current flowing in the bus bar.

20. The method of claim 15 , wherein the in-line electric power line monitoring device further comprises a first bracket connecting the electronics board cover to the bus bar, and a second bracket connecting the end plate to the bus bar.